Electrical condenser



vApril 3o, 1.935.

H. L. HARTzELl.

ELECTRICAL CONDENSER Filed Sept 30, 1931 wwf III/IIII/IIIIII lll/lVIII/I1 Patented Apr, 3o, 193s mesne assignments, to General MotorsCorporation, Detroit, Mich., a corporation of Delal ware ApplicationSeptemberr 30, 1931, Serial No. 566,001

10 Claims.

This invention relates to an electrical condenser and more particularlyto relatively small cylindrical condensers adapted for use with ignitionapparatus for internal combustion engines 5 of the automotive type.

Itis one of the objects of the present invention to provide a condenserof simple design and economic construction which will be substantiallymoisture proof. More specifically, it is an object to provide forsealing in the insulated terminal wire of the condenser which extendsthrough one end of the condenser case.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawing wherein a. preferred embodiment of one form of the presentinvention is clearly shown.

In the drawing:

. The figure of the drawing is a longitudinal sectional view on anenlarged scale of a condenser embodying the present invention.

The condenser embodying the present invention comprises convolutions offoil strips 20 and 2| alternating with nonconducting strips 22, thestrips being wound upon a cylindrical mandrel (not shown). The'sidemargins 23 of the 4 foil strip 2|)A extend beyond the side margins ofthe insulated strip 22 -at one edge thereof, and beyond the other edgeof the insulated strips 22 extends the side margins of the other foilstrip 2|. VAfter winding these strips of foil andv insulation upon amandrel, the assembly is coveredy with a wrapping of several turns ofinsulation paper 24. Then the mandrelis withdrawn. The condenser body isthen impregnated with wax by the well-known vacuum lmethodvofimpregnation. After impregnating and permitting the wax to cool, aninsulated terminal wire having a bared portion 3| is soldered to theprojecting margin of foil strip 2|, the solder being indicated at 32.This condenser assembly is now ready to be placed within a tubularcondenser Gase the closed end 4| of which is provided with ahole 42.`Before placing the assembly within the case there is placed within thecase a disc 43 having pointed projections 44 adapted to contact with thebent. over side margin 23 of the coil 20. Between the vdisc 43 and theend wall 4| is located a metal strip 45 having a portion bent around at46 and located as indicated at 41 between the` disc 43 and the bent sidemargin 23 of the coil 20.

The condenser assembly comprising the windwithin the case 40, theassembly being pushed into the case so that the foil margin 23 will bein firm engagement with the disc 43. Then a cap having a neck 5|apertured to receive the conductor 30 is placed around the conductorings and the attached conductor 30 is placed.

(c1. 175-41) I 'f while the conductor dangles loosely over the open endofthe case 40. 'I'hen a quantity of wax or pitch or other suitableinsulating compound 60 is poured into the condenser and while this waxis still plastic the cap 50 is moved along the c'onductor 30 and intothe case 40 thereby abutting the adjacent end of the wrapping 24 andthereby displacing some of the pitch causing the same to ow into theneck 5| and to seal the joint between the conductor 30 and the neck 5|.The cap 50 is held firmly in position by deforming or spinning over thenormally cylindrical periphery of the case 40, indicated in dot-and-dashlines 40a in the drawing to form an internal flange 48 bearing againstthe outer surface of the cap to hold the same permanently in position.During the operation of spinning the iiange 48, the cap 50 is forceddownwardly into the body of pitch 60 thereby crowding more of the pitchinto rthe neck 5| and downwardly into the body of the condenser. Theoperation offorming the flange 48 also causes the cap 50 to be forcedagainst the adjacent edge of the .wrapping 24 thereby causing the sameto be deformed as indicated at 24a. This assists also in perfecting theseal between the outer periphery cap 50 and the adjacent wall of thecase 40.

Following the operation of attaching the cap 5U the electricalconnection between the foil margin 23 and the case is completed byapplying solder at 10 to that portion of the strip 45 which wasaccessible through the hole 42.

Preferably, the strip 46 is attached to the foil margin before'assembling the disc 43 with the condenser lbody and before placing thelatter in the case. The strip 46 is a tinned copper strap which isunited with the foil margin 23 simply by heating the strip 46 while heldin contact with the foil margin.

While the form of embodiment of the present invention as hereindisclosed, constitutes a Dres ferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich follow.

What is claimed is as follows:

1. A condenser comprising in combinatio a tubular metallic case havingan integral end wall; a condenser body of insulated foils; meansconnecting one of the foils with the case; `a flexible insulated wireconnected with another foil; a cover for the case having an aperturethrough which the wire passes; a body of plastic insulating compound inthe case and between the condenser body and cover; means including apart of the case for securing the cover in position and for forcing theinsulating compound against the condenser body and about the connectedend of the insulated wire.

2. A condenser comprising 'in combination; a

tubular metallic case having an integral end wall, a condenser body ofinsulated foils; means connecting one of the foils with the case; aflexible insulated wire connected with another foil; a cover with anapertured neck having outwardly projecting flares through which saidconnector wire passes; a body of plastic insulating compound in thecase, said compound being located between said body and cover; meansincluding a part of said case for securing said cover in position andfor forcing said compound against said body and against said flares ofsaid cover so as to substantially surround the wire and foil con.

nections.

3. A condenser comprising in combination; a cup-shaped metallic case; acondenser body of insulated foils; one of said foils having a marginaledge adjacent the bottom wall and connected therewith; a flexibleinsulated wire connected with another foil; a cover having a neckthrough which the connecting wire passes; a plastic insulating compoundin said case between said body and cover; -means including a part ofsaid case for securing said cover in position and forcing said marginaledge against said case and urging said'compound against said body andcover forming a seal between said neck and insulated wire.

4. A condenser comprising in combination; a tubular metallic case; acondenser body of insulated foils, each of which has an exposed marginaledge; means for connecting one of the marginal edges with the case; aexible insulated conducting wire connected with another of said marginaledges; a cover having an apertured projection through which saidconducting wire passes; a plastic insulating compound embedding theconnected end of said conductor; and means on the case for securing saidcover in position and for forcing said compound against said condenserbody and cover and about the wire and f oil connection, so as to form aseal between said conductor and apertured projection and about the foilconnection.

5. A condenser comprising in combination; a tubulai` metallic case; acondenser body of insulated foils, one of said foils having a marginaledge; a connector engaging said marginal edge and connecting said edgewith said ease; an insulated wire connected with another foil; a dischaving a charnfered opening through which said connecting wire passes;ayieldable insulating compound in said case between said condenser bodyand disc; means including a part of said case for securing said disc inposition and forc- .ing said marginal edge against said connector andcase and urging said compound against said body and cover; and meansincluding said disc for forcing the insulating compound to enclose theconnection of the wire and foil, whereby th connection is sealed againstcorrosion. i

6. A condenser comprising in combination; a tubular metallic case; aroll of conducting elements and insulating material; a conductor forconnecting one of said elements with said case; an insulated wireconnected to another of said elements; a cover for said case having anaper tured neck through which said conductor passes; a plasticinsulating compound within said case', and means at one end of said casesecuring said cover in position and forcing said compound against saidroll and cover to form a seal between the same and so as to immerse theconnection of the wire with the said other conduction element.

7. A condenser comprising in combination, a tubular body comprisingwindings of foil and strips of insulating material; a cup-shaped tubularmetallic case inclosing said body; a conductor for connecting one end ofone of the foils with the case; an insulated wire connected with anotherfoil, a wrapping of sheet insulating paper about the condenser body andhaving an edge extending beyond the body; a cover for said case havingan aperture through which the wire passes; a body of plastic insulatingcompound within the case; and means including a part of said case forsecuring said cover in position and for forcing the cover against saidwrapping edge and insulating compound so as to force the body againstthe bottom of the case and to press said compound between the cover andwire to form a seal between said wire and aperture of said cover, and soas to cause the compound to ilow about the connection of the wire withthe said foil.

8. A condenser comprising in combination; a tubular metallic case; atubular condenser body of insulated foils and having layers ofinsulating material about and protruding beyond one end of said body; aflexible conductor joined to one of said foils; a conductor connected toanother foil, said conductor being interposed between the body and thecase; a cover having an apertured projection through which said flexibleconductor passes; a plastic insulating compound embedding the flexibleconductor and extending through the body within the case; common meansincluding a part of the case for securing the cover in place and forforcing the layer of insulation to carry the body against the bottom ofthe case, the cover forcing the insulating material against thecondenser body and causing it to immerse the end of said flexibleconductor that is joined to the foil.

9. In a condenser for relectrical ignition purposes the combinationcomprising a drawn metal cup-like casing, a condenser assembly disposedwithin the casing and including alternating insulators and foil stripshaving oppositely exposed' margins, and a flexible insulated wire bondedin electrical connection to one of said foil margins, an apertured coverfor the case and disposed about one end of the flexible wire so as toenclose its bonded connection with the foil margin, a quantity ofinsulating compound filling the remaining space within the case andcover, and means including a part of the case and cover for forcing thecover against the insulating compound so 'as to press the compoundagainst the condenser assembly and substantially submerge the bondedconnection between the wire and the respective foil margin.

10. In an electrical condenser having a case, a condenser body ofalternating insulators and foil strips each with an exposed portion, andin which a flexible conductor is soldered to one of the exposedportions, and a cover for closing the case and guiding the flexibleconductor, the combination comprising, a quantity of insulating compoundillling the remainder of the case, and means including the case forcausing the cover to press against the insulating compound whereby theinsulating compound is caused to flow substantially'into all of therecesses within the condenser assembly and to completely cover thesoldered connection between the flexible conductor and its respectivefoil margin.

HERMAN L. HARTZELL.

